Daylight lamp



1944- w. H. GLOVER 3,364,707

DAYLIGHT LAMP Filed May 31, 1943 INVENTOR. #4 6493146) 6201467? BYArraR/m-W Patented Dec. 12, 1944 UNITED STATES PATENT OFFICE;

DAYLIGHT LAMP William Harvey Glover, Newark, N. J.

ApplicationMay 31, 1943, Serial No. 489,229

4 Claims.

practical value, even with the use of high wattage lamps. Also the areailluminated, would be too small for practical purposes.

The; objects of the present invention are to eliminate. faults such asdescribed and others, and to. provide a daylight, lamp for colorcomparison or other purposes, which will have the advantages of, highefficiency, thatis, low wattage requirements for a good brilliant levelof illumination over. an area largeenough for all practical purposes;which will have flexibility, enabling ready compensation of the filtersystem for providing a viewing light having substantially true daylightvalue or any special type light needed, a'ndfwhich will be accurate forall color comparisons.

The foregoing. and other desirable objects areattained by the novelfeatures of construction,

combination and arrangement of parts. hereinafter set forth and broadlyclaimed.

The drawing illustrates one of the present practical embodiments of theinvention. Structure however may be modified and changed as regards.

this particular illustration, all within the true intentand scope of theinvention as hereinafterdeflned and claimed.

Fig. 1 in the drawing is a side elevation of the complete lamp, partlyin section to disclose internal features of construction.

Fig. 2 is. a planview of the filter disc.

In, principle, the invention involves the rapid mixingand projecting ofcolors, in which the light sourcev is deficient and in the proportionswith a rigid ceiling post l4, firmly connected with the upper end of themotor frame at [5.

Thelamps are shown mounted on a transverse partition, [5, attached. tothe lower end of the motor frame and carrying a lower bearing ll, forthe spindle I8, which carries the color disc.

Partition [6-, also serves in. the illustration as a support for thedownwardly flaring reflector housing 8-, and for the motor enclosure 19,forming, an' upward continuation of the reflector.

To disposeof a part of the heatgenerated by the lamps, the partition isshown; as having air passages 21!, therethrough and the motor shaft orspindle which is attached thereto. is shown. as

carrying a fan 2L, back of. the partition and design to-create a forceddraft which will draw in air around and over the edges of the rotatingdisc and pass it upward and outward through relief openings 22, in thetop of the motor housing.

Other ventilating openings may be provided, if desired, in the sides ofthe reflector housing as indicated at 23.

To provide necessary space for the fan, at the back of the lamp support,[6, an open sided spacing bracket 24, may be interposed between thelower end of. the motor and said support. A similar mounting bracket,such as indicated at 25, may be provided between the-supporting post andthe upper end of the motor.

An annular guard 26, is shown removably secured at 2'], to the lower endof thereflector housing to prevent accidental contact with the rotatingdiscand space is indicated at 28, to pro Vide free passage of air upinto the housing. all about the edge of the rotating disc.

The color disc is shown as removably heldbetween washers 29, on thelower end of thespindle by a securing nut 30.

In Fig. 2, the approximate proportions of the color segments areindicated. In this view, the blue segment takes up about or the redsegment about f th or 675 and the yellow segment about i gth or 22.5.

These proportions may vary but with lamps now. avai1able, the blue willlargely predominate, with materially less red and much less yellow thanred.

The speed of rotation also may vary, but at the speed mentioned, thatis, 3400 R. P. M. the daylight efiect will be uniform and constantthroughout a wide field covered by the reflector, without any observableflicker or flash of individual ,colors. The vertical elongated form ofcasing illustrated forms a natural chimney assisting in preventingoverheating of the color disc, so that in operation, the fan may not beactually essential. The high speed rotation of the disc tends to keep itcool enough to prevent warping, cracking or formation of any ripples orunevenness.

Without the fan though and even in some cases with the fan, particularlywith more concentrated or intense light sources, it may be desirable tokeep the disc spinning for a time after the lamps have been out off toexpedite uniform and even cooling of the same.

For the latter purpose, there may be provided an automatic timing switchin the motor circuit which, after a time, say approximately fiveminutes, will automatically out off the motor after a switch has beenthrown which cuts off the lamps.

While transparent plastic such as Lucite, because of its exceptionallight transmitting qualities, light weight and other desirablecharacteristics, has been preferred, the invention contemplates thatglass or the like may be used in the construction of the color disc.

At present, the light disc is made up by cutting segments of color filmsin the proportions selected and cementing these between thin layers ofLucite.

These discs can be easily made up in selected color combinations to meetspecial or unusual conditions and the method of mounting shown enablesone color combination to be quickly substituted for another wheneveroccasion demands.

Details of wiring are not illustrated, further than to indicate that asingle control switch 3|, may be provided in the supply circuit 32, forturning the lamps on and off, said switch incorporating the necessarytiming mechanism for automatically turning the motor off a predeterminedperiod of time after the lamps have been turned off.

The structure is rugged and well designed to take care of the high speedrotation of the color disc under the heat conditions generated by thehigh intensity lamps. The latter are supported in spaced relation aboutthe extended lower bearing for the motor shafting or spindle. Thelocation of the motor in back of the supporting partition and the lampsin front of the partition within the light reflector casing enables thehousing to be kept down to practical overall dimensions.

What is claimed is:

1. A daylight lamp, comprising a vertical suspension post, a verticalshaft motor secured at its upper end to said post, a horizontalpartition secured to the lower end of said motor, lamps mounted on theunderside of said partition, a light reflector suspended from saidpartition, a spindle journalled on said partition and forming anextension of the lower end of the motor shaft, acolor disc mounted onthe lower end of said spindle within said reflector, said motor beingspaced above the partition and carrying a fan operating in the space soprovided, said partition having air passages therethrough and the edgeof the color disc being spaced from the surrounding wall of thereflector to admit flow of air drawn across the face of the disc uparound the edges of said disc.

2. A daylight lamp, comprising a vertically extended chimney-likecasing, having upper and lower compartments, the lower compartmentopening downwardly and forming a reflector casing, a motor in the uppercompartment having a vertical shaft extended downwardly through thecenter of the reflector casing, a color disc on the lower end of theextended shaft of the motor and lamps within the reflector casing at thesides of the downwardly extended motor shaft, a horizontal partitionwithin the housing separating the upper and lower compartments andforming a support for said lamps and a bearing for the lower portion ofthe extended shaft, said bearing being carried by said partition andextended downwardly into the reflector casing.

3. A daylight lamp, comprising a vertically extended chimney-likecasing, having upper and lower compartments, the lower compartmentopening downwardly and forming a reflector casing, a motor in the uppercompartment having a vertical shaft extended downwardly through thecenter of the reflector casing, a color disc on the lower end of theextended shaft of the motor and lamps within the reflector casing at thesides of the downwardly extended motor shaft, a horizontal partitionwithin the housing separating the upper and lower compartments andforming a support for said lamps, a bearing for the lower portion of theextended shaft, said bearing being carried by said partition andextended downwardly into the reflector casing and an air circulating fanon the motor shaft above said partition, the latter being open to passair therethrough and the color disc being spaced from the wall of thereflector casing to admit cooling air about the perimeter of said disc.

4. A daylight lamp comprising a support, a motor suspended by saidsupport, a horizontal partition below said motor, a source of lightbeneath said partition, a light reflector supported by said partition, aspindle driven by the motor and extending down through the reflector, acolor disc carried by said spindle and disposed within the reflector, afan above the partition and operated by the motor, said partition havingair passages therethrough and the edge of the color disc being spacedfrom the surrounding wall of the reflector to admit flow of air drawnacross the face of the disc up around the edges of the disc and controlmeans for said light source and motor including manually operable switchmechanism for arbitrarily turning on and oil the light source at anytime and automatic time delay switch means associated with saidarbitrarily operable switch mechanism for turning off the motor apredetermined time after the manually operable switch mechanism has beenoperated to turn off the light source, whereby to continue the aircirculation and the color disc in rotation for a time after the lightsource has been out off.

WILLIAM HARVEY GLOVER.

